Dyfyniad APA

DeMers, M. N. (2005). Fundamentals of geographic information systems (3rd ed.). John Wiley & Sons.

Dyfyniad Arddull Chicago

DeMers, Michael N. Fundamentals of Geographic Information Systems. 3rd ed. New York ; New Delhi: John Wiley & Sons, 2005.

Dyfyniad MLA

DeMers, Michael N. Fundamentals of Geographic Information Systems. 3rd ed. John Wiley & Sons, 2005.

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